Abstract
ABSTRACT SLOPING infiltration areas with enclosing dikes and subsurface drains were evaluated for their effectiveness in removing pollutants from the runoff water from a small paved feedlot. Two designs of this forced infiltration system concept were tested simultaneously. The results were compared to the quantity and quality of discharge from sodded filter strips tested previously. Volume of discharge, chemical oxygen demand, total solids, ammonium nitrogen, total nitrogen, nitrate nitrogen, organic nitrogen, soluble phosphorus, total phosphorus and potassium were determined for the tile outflow from various sampling points within each system. The system with a single subsurface drain parallel to the surface slope discharged less of all pollutants than two consecutive 30 m long sodded filter strips. The other system with a series of cross slope subsurface drains and surface dikes discharged about the same amount of pollutant as the first of two consecutive 30 m long filter strips but more than the second filter strip.
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